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257b49e3 MM |
1 | /* |
2 | * Copyright (C) 2013 Broadcom Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License as | |
6 | * published by the Free Software Foundation version 2. | |
7 | * | |
8 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
9 | * kind, whether express or implied; without even the implied warranty | |
10 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/of_address.h> | |
15 | #include <asm/io.h> | |
16 | ||
17 | #include "kona.h" | |
18 | ||
19 | static void __iomem *watchdog_base; | |
20 | ||
21 | void bcm_kona_setup_restart(void) | |
22 | { | |
23 | struct device_node *np_wdog; | |
24 | ||
25 | /* | |
26 | * The assumption is that whoever calls bcm_kona_setup_restart() | |
27 | * also needs a Kona Watchdog Timer entry in Device Tree, i.e. we | |
28 | * report an error if the DT entry is missing. | |
29 | */ | |
30 | np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt"); | |
31 | if (!np_wdog) { | |
32 | pr_err("brcm,kona-wdt not found in DT, reboot disabled\n"); | |
33 | return; | |
34 | } | |
35 | watchdog_base = of_iomap(np_wdog, 0); | |
36 | WARN(!watchdog_base, "failed to map watchdog base"); | |
37 | of_node_put(np_wdog); | |
38 | } | |
39 | ||
40 | #define SECWDOG_OFFSET 0x00000000 | |
41 | #define SECWDOG_RESERVED_MASK 0xE2000000 | |
42 | #define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000 | |
43 | #define SECWDOG_EN_MASK 0x08000000 | |
44 | #define SECWDOG_SRSTEN_MASK 0x04000000 | |
45 | #define SECWDOG_CLKS_SHIFT 20 | |
46 | #define SECWDOG_LOCK_SHIFT 0 | |
47 | ||
48 | void bcm_kona_restart(enum reboot_mode mode, const char *cmd) | |
49 | { | |
50 | uint32_t val; | |
51 | ||
52 | if (!watchdog_base) | |
53 | panic("Watchdog not mapped. Reboot failed.\n"); | |
54 | ||
55 | /* Enable watchdog2 with very short timeout. */ | |
56 | val = readl(watchdog_base + SECWDOG_OFFSET); | |
57 | val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK; | |
58 | val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK | | |
59 | (0x8 << SECWDOG_CLKS_SHIFT) | | |
60 | (0x8 << SECWDOG_LOCK_SHIFT); | |
61 | writel(val, watchdog_base + SECWDOG_OFFSET); | |
62 | ||
63 | while (1) | |
64 | ; | |
65 | } |